Pharmaceutical composition containing a 2-amino-4,5,7,8-tetrahydro-6H-thiazolo or -oxazolo 5,4-D azepine and method of use

ABSTRACT

Pharmaceutical compositions containing as an active ingredient a compound of the formula   wherein R1 is hydrogen, straight or branched alkyl of 1 to 4 carbon atoms, hydroxy-alkyl of 1 to 4 carbon atoms, allyl, cycloalkyl, hexahydrobenzyl, phenyl, phenethyl, benzyl, mono- or dihalobenzyl, mono-, di- or tri-methoxybenzyl, trifluoromethylbenzyl or (alkyl of 1 to 3 carbon atoms)-benzyl, and R2 is hydrogen, straight or branched alkyl of 1 to 5 carbon atoms, allyl, cycloalkyl, phenyl, benzyl or phenethyl, OR A NON-TOXIC, PHARMACOLOGICALLY ACCEPTABLE ACID ADDITION SALT THEREOF; AND A METHOD OF USING THE SAME AS HYPOTENSIVES, SEDATIVES, ANTITUSSIVES AND ANTIPHLOGISTICS.

United States Patent Griss et al.

[ Sept. 23,1975

[ PHARMACEUTICAL COMPOSITION CONTAINING A 2-AMINO-4,5,7,8-TETRA- HYDRO-6H-THIAZOLO OR -OXAZOLO 5,4-D AZEPINE AND METHOD OF USE [75] Inventors: Gerhart Griss; Manfred Kleeman;

Wolfgang Grell; Helmut Ballhause, all of Biberach an der Riss,. Germany [73] Assignee: Boehringer Ingelheim GmbH,

lngelheim am Rhein, Germany [22] Filed: Jan. 23, 1974 [21] Appl. No.: 435,719

Related U.S. Application Data [62] Division of Ser. No. 169,065, Aug. 4, 1971, Pat. No.

[30] Foreign Application Priority Data Aug. 14, l970 Germany 2040510 June 2, l97l Germany 2l27267 [52] U.S. Cl 424/270; 424/272 [51 Int. Clf C07D 498/04; C07D 513/04 [58] Field of Search 260/3068 F, 307 R;

[56] References Cited UNITED STATES PATENTS 3,725,548 4/1973 Shen et al. 424/270 3,755,587 8/1973 Plumpe et al.. 424/270 3,804,849 4/1974 Griss et al. 260/306.8 F

3,821,386 6/1974 Loev 424/270 Primary Examiner-R. Gallagher Attorney, Agent, or FirmHammond Littell 5 7 ABSTRACT Phannaceutical compositions containing as an active ingredient a compound of the formula wherein R is hydrogen, straight or branched alkyl of l to 4 carbon atoms, hydroxy-alkyl of l to 4 carbon atoms, allyl, cycloalkyl, hexahydrobenzyl, phenyl, phenethyl, benzyl, monoor di-halobenzyl, mono-, dior tri-methoxybenzyl, trifluoromethylbenzyl or (alkyl of l to 3 carbon atoms)-benzyl, and R is hydrogen, straight or branched alkyl of l to 5 carbon atoms, allyl, cycloalkyl, phenyl, benzyl or phenethyl, or a non-toxic, pharmacologically acceptable acid ad dition salt thereof; and a method of using the same as hypotensives, sedatives, antitussives and antiphlogistics.

12 Claims, No Drawings PHARMACEUTICAL COMPOSITION CONTAINING A 2-AMINO-4,5,7,S-TETRAHYDRO-6H-THIAZOLO OR -OXAZOLO 5,4-D AZEPINE AND METHOD OF USE This is a division of copending application Ser. No. 169,065, filed Aug. 4, 1971, now US. Pat. No. 3,804,849 issued Apr. l6, 1974.

This invention relates to novel pharmaceutical compositions containing as an active ingredient a Z-amino- 4,5 ,7 ,8-tetrahydro-6H-thiazolo or -oxazolo[ ,4- d]azepine or a non-toxic acid addition salt thereof, as well as to a method of using the same as hypotensives, sedatives, antitussives and antiphlogistics.

More particularly, the present invention relates to pharmaceutical compositions containing as an active ingredient a fused-ring compound of the formula METHOD A By reacting a hydrohalic acid addition salt of a 5- halo-azepin-4 one of the formula Hal --HHal 11 wherein R, has the same meanings as in formulas I and la, and Hal is chlorine, bromine or iodine, with urea or a thiourea of the formula wherein R has the same meanings as in formula I.

The reaction is preferablyperformed in the molten state and, if necessary, in the presence of a catalytic amount of an acid, such as glacial acetic acid; however, it may also be performed in the presence of a solvent medium.

When the S-halo-azepinone salt (II) is reacted with a thiourea (Ill), the reaction may be performed, for example, in the presence of a solvent medium, such as an aliphatic alcohol, dimethylformamide, glacial acetic acid, water or a mixture of any two or more of these, at a temperature between room temperature and the boiling point of the solvent medium, and optionally in the presence of an acid-binding agent.

When the S-halo-azepinone salt is reacted with urea, the reaction may likewise by performed in the presence of a solvent medium, such as ethanol, isopropanol, tert- Lbutanol', glacial acetic acid, dioxane, dimethylformamide or a mixture of any two or more of these, at a temperature up to the boiling point of the solvent medium, and optionally in the presence of an acid, such as glacial acetic acid.

Examples of suitable acid-binding agents are inorganic bases, such as sodium carbonate or potassium carbonate, or tertiary organic bases, such as triethylamine or pyridine. When used in commensurate excess,

the organic base may simultaneously serve as the solvent medium.

METHOD B wherein R has the same meanings as in formula I and Ac is carboxylic acyl, such as benzoyl, with an alkyleneoxide of the formula R, cH cH -R, v)

wherein R is hydrogen or alkyl of l to 2 carbon atoms, followed by removal of the acyl radical by acid hydroly- SIS.

The reaction is preferably performed in the presence of a solvent, such as methanol, and at temperatures between 0 and 25C. If the reaction requires higher temperatures, it is advantageously performed in a pressure vessel, such as an autoclave.

The subsequent acid hydrolysis is performed in the presence of an inert solvent at temperatures up to the boiling point of the solvent, pursuant to conventional methods.

The compounds embraced by formulas I and la are organic bases and therefore form acid addition salts with inorganic or organic acids. Examples of nontoxic, pharmacologically acceptable acid addition salts are those formed with hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, tartaric acid, succinic acid, citric acid, adipic acid, pamoic acid, fumaric acid, maleic acid, 8-chlorotheophyl1ine or the like.

The starting compounds of the formula 11 for method A may be prepared by halogenating the corresponding azepin-4-ones in glacial acetic acid with an equimolar amount of chlorine, bromine or iodine, and do not need to be purified prior to use as starting compounds in this method.

Some of the azepin-4-ones needed for the preparation of starting compounds 11 are described in the literature [see Ak. Yokov et al., Bull. Chem. Soc. Japan 29, 631 (1959)]. The l-substituted azepin-4-ones, which are not described in the literature, may be prepared by the Dieckmann condensation (Organic Reactions 15, 1-203) of ethyl N-substituted N-(2 ethoxycarbonylethyl)-4-amino-butyrates, using preferably potassium tert.-butylate or sodium hydride as the condensation agent, followed by hydrolysis and decarboxylation of the mixture of l-substituted ethyl hexahydro-4H-azepin-4-one-3- and S-carboxylates intermediates in the presence of acids. The lR-band of the carbonyl group of these compounds lies at 1695-1700 cm (methylene chloride), and that of their salts at 1720 cm (KBr).

The starting compounds of the formula [V for method B may be obtained by reacting 5-bromoazepin-4-one with correspondingly N-acylated thiourea.

The following examples illustrate the preparation of compounds of the formula 1 and la and non-toxic acid addition salts thereof.

EXAMPLE 1 2-Amino-6-benzyl-4,5,7,8-tetrahydro-6H-thiazolo[5,4- d]azepine and its dihydrochloride by method A A mixture consisting of 1 1 gm (34.6 millimols) of 1- benzy1-5 -bromo-hexahydro-1H-azepin-4-one hydrochloride [m.p. 158C; prepared from l-benzylhexahydrol H-azepin-4-one hydrochloride (m.p.

189C) by bromination with an equimolar amount of bromine in glacial acetic acid], 50 ml of water and 2.63 gm (34.6 millimols) of thiourea was stirred for 12 hours at room temperature. Thereafter, the reaction solution was adjusted to pH 12 withsodium hydroxide, admixed with 20 ml of methanol, and the mixture was extracted with chloroform. The chloroform extracts were dried over sodium sulfate and evaporated. The residue, 2- amino-6-benzyl-4,5,7,8-tetrahydro-6Hthiazolo[5,4- d]azepine, was dissolved in hot ethanol, and the resulting solution was acidified with isopropanolic hydrochloric acid. Upon cooling, 6.2 gm (51% of theory) of the dihydrochloride, m.p. 233C (decomp.), of the formula crystallized out.

Analysis: C H, N S 2 HCl; mol. wt. 332.30. Calculated: C, 50.70%; H, 5.77%; N, 12.65%. Found: C, 50.30%; H, 5.84%; N, 12.80%.

EXAMPLE 2 A mixture consisting of 77.5 gm (208 millimols) of 1-benzyl-5-bromo-hexahydro-4-H-azepin-4-one hydrobromide, 600 ml of ethanol and 15.8 gm (208 millimols) of thiourea was heated at its boiling point for two hours, during which time 2-amino-6-benzyl-4,5,7,8- tetrahydro-6H-thiazolo[ 5 ,4-d azepine hydrobromide crystallized out. After cooling, the crystals were collected by vacuum filtration, dissolved in water, the aqueous solution was adjusted to pH 12 with sodium hydroxide, and the free base liberated thereby was extracted with chloroform. The chloroform extracts were evaporated, the residue was dissolved in 100 ml of hot ethanol, and the hot solution was admixed with 50 ml of saturated isopropanolic hydrochloric acid and 100 ml of ethyl acetate. Upon cooling, 40 gm (59% of theory) of 2-amino-6benzyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine dihydrochloride, m.p. 233C (decomp.), crystallized out.

EXAMPLE 3 1 1 gm (34.6 millimols) of l-benzyl-S-bromohexahydro-4H-azepin-4-one hydrobromide and 3.63 gm (34.6 millimols) of thiourea were intimately admixed with each other, and the mixture was melted by heating it to between and C for 10 minutes. Thereafter, the molten mass was allowed to cool, was then dissolved in water, and the aqueous solution was made alkaline with sodium hydroxide and then thoroughly extracted with chloroform. The combined chloroform extracts were evaporated to dryness, the residual free base was dissolved in hot ethanol, and the hot solution was acidified with isopropanolic hydrochloric acid. Upon addition of ethyl acetate, 3.1 gm (25.5% of theory) of 2-amino-6-benzyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine dihydrochloride, m.p. 233C (decomp.), crystallized out.

EXAMPLE 4 2-Amino-6-benzyl-4,5,7,8-tetrahydro-6H-thiazolo[5,4- d]azepine dihydrochloride by method A A solution of 6.1 gm (30 millimols) of l-benzylhexahydro-4-H-azepin-4-one (b.p. 98-100C at 0.1 mm Hg) in a mixture of 100 ml of glacial acetic acid and 15 ml of a 40% hydrobromic acid solution in glacial acetic acid was admixed at room temperature with a solution of 4.8 gm (30 millimols) in 50 ml of glacial acetic acid. The glacial acetic acid and the hydrobromic acid were then distilled off in vacuo, the residual oily 1-benzyl-5-bromo-hexahydro-4H-azepin-4-one hydrobromide was dissolved in 200 m1 of ethanol, the ethanolic solution was admixed with 2.28 gm (30 millimols) of thio-urea, and the mixture was heated at its boiling point for 2 hours. Upon cooling, 2-amino-6- benzyl-4,5 ,7 ,8-tetrahydro -6 H-thiazolo[ 5 ,4-d azepine hydrobromide crystallized out, which was converted into its dihydrochloride, m.p. 232C, as described in Example 2. The yield was 6 gm (60% of theory).

Analysis: C H N S 2 HCI; mol. wt. 332.30. Calculated: C, 50.70%; H, 5.77%; N, 12.65%. Found: C, 50.49%; H, 6.01%; N, 12.58%.

EXAMPLE 5 Using a procedure analogous to that described in Example 4, 2-amino-6-( p-fluoro-benzyl )-4,5 ,7,8- tetrahydr0-6H-thiazolo[5,4-d]azepine dihydrochloride, mp. 236C (decomp.), of the formula was prepared from 1-( p-fluoro-benzyl)-hexahydro-4H- azepin-.4- one. hydrochloride mp. 208C). The, yield was 55% of theory. I

Analysis: C I-1, 1 N S 2 BC]; mol. wt. 350.29. Calculated: C, 48.00%; 1-1, 5.l7%; N, 12.00%.,Found: C, 48.00%; 1-1, 5.10%; N, 12.20%..

7 EXAMPLE 6 ,Using a procedure analogous to that described in-Example 4, 2-amino-6-(.p-chloro-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[ 5 ,4-d azepine dihydrochloride, m.p. 243C, of the formula was prepared from 1-(p-chloro-benzy1)-hexahydro-4H- azepin-4-"one hydrochloride (210C). The yield was 53% of theory. I

Analysis: C ,,H C1N S 2 HCl; molfwt. 366.74. Calculated: C, 45.86%; H, 4.95%; N, 11.46%. Found: C, 45.80%; H, 5.03%; N, 11.26%.

EXAMPLE 7 Using a procedure analogous to that described in Example. 4," tetrahydro-6H-thiazo1o[5 ,4-d]azepine dihydrochloride, mp. 244C, was prepared from l-(m-chlorobenzyl)-hexahydro-41-l-azepin-4-one hydrochloride (212C). The. yield was 46% of theory.

Analysis: C H ClN S 2 HCl; mol. wt. 366,74. Ca1- culated: C, 45.86%; H, 4.95%; N, 11.46%. Found: C, 45.80%; H, 4.09%; N, 11.30%.

EXAMPLE 8 Using a procedure analogous to that described in Ex-,

-hexahydro-4H-azepin-4 one tetrahydro-6H-thiazolo[ 5 ,4-d azepine '6 2-amino-'6-(m,p-dichloro-benzyl)-4,5,7,8- dihydrochloride, mp. 246C (decomp.), of the formula ample 4,

N c1 -cH,- N ,NH2. 2 HCI was prepared from l-(m,p-dich1oro-benzyl)- hydrochloride (IR- spectrum in KBr: carbonyl band'at'l720 cm)."The yieldfwas 28% of theory.

' Analysis: C H CI N S 2 HCl; mol. wt. 401.19. Calculated: C, 41.91%; H, 4.27%; N, 10.47%. Found: C, 42.00%; H, 4.20%; N, 10.32%.

EXAMPLE 9 EXAMPLE 10 Using a procedure analogous to that described in Example 4, 2-amino-6-(o,p-dichloro-benzyl)-4,5,7,8- dihydrochloride, mp. 230C (decomp.), was prepared from 1-(o,pdichloro-benzyl )-hex'ahydro-41-1-azepin-4-one I chloride (IR-spectrum in KBr: carbonyl band at 1720 2-amino-6-(-m-chloro-benzyl)-4,5,7,8- 4

cm"). The yield was- 56% of theory.

Analysis: C l-1 C1 N S 2 HCl; mol. wt. 401.19. Calculated: C, 41.91190, 1'1, 4.27%; N, 10.47%.

Fdulnd: C, 41.90%,1'1, 4.43%; N, 10.75%.

. EXAMPLE 11 Using a procedure analogous to that described in Example v 4, 2-amino-6-(p-bromo-benzyl)-4,5,7,8- tetrah'ydro-6H-thiazolo[ 5 ,4-d azepine dihydrochloride, mp. 251C (decomp.), was prepared from l-(pbromo-benzyl) hexxahydro-4l-l-aaepin-4-or1e hydrochloride (m.p. 215C). The yield was 49% of theory.

Analysis: c,.H,.,Br s 2 HCl; mol. wt. 41 1.20. Calculated: C, 40.89%; H, 4.41%; N, 10.22%. Found: C, 40.85%; H,4.56%; N, 9.95%.

EXAMPLE 12 Using a procedure analogous to that described in Example 4, 2-amino-6-(o'-bromo-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[ 5 ,4-d azepine dihydrochloride, mp. 233C (decomp.), was prepared from 1-(0- bromo-benzyl)-hexahydro-41-1-azepin-4-one hydrochloride (mp. 179C). The yield was 18% of theory.

Analysis: c..H,,Br ,s 2 BC]; mol. wt. 411.20. Calculated: c, 40.89%; H, 4.41%; N, 10.22%. Found: c, 41.20%; 11, 4.66%; N, 9.85%.

EXAMPLE 13 Using a procedure analogous to that described in Example 4, 2-amino-6-(m-bromo-benzyl)-4 ,5,7,8- tetrahydro-6H-thiazolo[5,4-d1a2epine dihydrochloride, m.p. 255C (decomp.), of the formula N CH. N NH flHCl was prepared from l-(m-bromo-benzyl)-hexahydro- 4H-azepin-4-one hydrochloride (m.p. 192C). The yield was 20% of theory.

Analysis: C H BrN S 2 HCl; mol. wt. 41 1.20. Calculated: C, 40.89%; H, 4.41%; N, 10.22%. Found: C, 40.85%; H, 4.57%; N, 10.08%.

EXAMPLE 14 Using a procedure analogous to that described in Example 2, 2-amino-6-(p-methyl-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochloride, m.p. 239C (decomp.), of the formula NH2 2 HCl was prepared from 1-(p-methyl-benzyl)-5-bromohexahydro-4H-azepin-4-one hydrobromide v(m.p. 155l56C). The yield was 20% of theory.

Analysis: C, H, N S 2 HCl; mol. wt. 346.32. Calculated: C, 52.02%; H, 6.11%; N, 12.13%. Found: .C, 51.90%; H, 6.29%; N, 12.28%.

EXAMPLE Using a procedure analogous to that described in Example 4, 2-amino-6-(o-methyl-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochloride, m.p. 241C (decomp.), was prepared from l-(omethyl-benzyl)-hexahydro-4H-azepin-4-one hydrochloride (m.p. 165C). The yield was 36% of theory.

Analysis: C, H N S 2 HCl; mol. wt. 346.32. Calculated: C, 52.02%; H, 6.11%; N, 12.13%. Found: C,

EXAMPLE 16 EXAMPLE 17 Using a procedure analogous to that described in Example 4, 2-amino-6-(p-trifluoromethyl-benzyl)- 4,5,7,8-tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochloride, m.p. 237238C, of the formula was prepared from l-(p-trifluoromethyl-benzyl)- hexahydro-4H-azepin-4-one hydrochloride (IR- spectrum: carbonyl band at 1700 cm). The yield was 30% of theory.

Analysis: C H F N s 2 HCl; mol. wt. 400.30. Calculated: C,'45.01%; H, 4.54%; N, 10.50%. Found: C, 44.80%; H, 4.74%; N, 10.41%.

EXAMPLE 18 Using a procedure analogous to that described in Example 4, 2-amino-6-(m-trifluoromethyl-benzyl)- 4,5,7,8-tetrahydro-6H-thiazolo[5,4d]azepine dihydrochloride, m.p. 246C (decomp.), was prepared from l-(m-trifluoromethylbenzyl)-heXahydro-4H-azepin' 4-0ne hydrochloride (m.p. 176178C). The yield was 25.5% of theory.

Analysis: C, H, F N S 2 HCl; mol. wt. 400.30. Calculated: C, 45.01%; H, 4.54%; N, 10.50%. Found: C, 44.80%; H, 4.74%; N, 10.41%.

EXAMPLE 19 Using a procedure analogous to that described in Example 4, 2-amino-6-(p-methoxy-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochlor ide, m.p. 230C (decomp.), of the formula was prepared from 1-(p-methoxy-benzyl)-hexahydro- 4H-azepin-4-one hydrochloride (IR-spectrum in KBr: carbonyl band at 1720 cm). The yield was 31% of theory.

Analysis: C H, ON S 2 HCl; mol. wt. 362.32. Ca1- culated: C, 49.72%; H, 5.84%; N, 11.59%. Found: C, 49.70%; H, 5.96%; N, 11.85%.

EXAMPLE 20 Using a procedure analogous to that described in Example 4, 2-amin0-6-(m,p-dimethoxy-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochloride, m.p. 239C. (decomp.), of the formula OC H @ Mags was prepared from l-(m,p-dimethoxy-benzyl)- I he xahydro-4H-azepin-4-one hydrochloride (IR- spectrum in K Br: carbonyl band at 1720 cm). The yield was 44% of theory.

Analysis: C H O N S 2HC1; mol. wt. 392.35. Calculated: C, 48.99%; H, 5.91%; N, 10.72%. Found: C, 49.00%; H, 5.65%; N, 10.53%.

EXAMPLE 21 Using a procedure analogous to that described in Example 4, 2-amino-6-(3',5'-dimethoxy-benzyl)-4,5,7,8- tetrahydro-GH-thiazolo ,4-d azepine dihydrochloride, m.p. 215C. (decomp.), was prepared from 1- (3 ,5 '-dimethoxy-benzyl )-hexahydro-4H-azepin-4-one hydrochloride (IR-spectrum in KBr: carbonyl band at 1720 cm). The yield was 28% of theory.

Analysis: C H O N S 2 HCl; mol. wt. 392.35. Calculated: C, 48.99%; H, 5.91%; N, 10.72%. Found: C, 48.80%; H, 6.20%; N, 10.40%.

EXAMPLE 22 EXAMPLE 23 Using a procedure analogous to that described in Example 4, 2-amino-6-(3,4',5'-trimethoxy-benzyl)- 4,5 ,7,8-tetrahydro-6H-thiazolo[5,4-d]azepine dihydrochloride, m. p. 230C. (decomp.), of the formula was prepared from l-(3',4,5'-trimethoxy-benzylhexahydro-4H-azepin-4-one hydrochloride (IR- spectrum in K Br: carbonyl band at 1720 cm). The yield was 53% of theory.

Analysis: C H O N S 2 Hcl; mol. wt. 422.38 Calculated: C, 48.34%; H 5.97%; N 9.95%. Found: C 48.20%; H 5.96; N 10.00%.

EXAMPLE 24 Using a procedure analogous to that described in Example 4, 2-amino-6-phenyl-4,5,7,8-tetrahydro-6H- thiazolo [5,4-d]azepine dihydrochloride, m. p. 202C. (decomp.), of the formula 10 was prepared from 1-phenyl-hexahydro-4H-azepin- 4-one hydrochloride (m. p. 144C.). The yield was 14% of theory.

Analysis C H N S 2 HCl; mol. wt. 318.27.Calculated: C, 49.05%; H 5.39%; N 13.20%. Found: C 49.30%; H 5.50%; N 13.45%.

EXAMPLE 25 Using a procedure analogous to that described in Example 4, 2-amino-6-(B-phenethyl)-4,5,7,8-tetrahydro- 6H-thiazolo[5,4-d]azepine dihydrochloride, m. p. 226C. (decomp.), of the formula was prepared from l-(B-phenethyl)-hexahydro-4H- azepin-4-one (b. p. 130-l34C. at 0.4 mm Hg). The yield was 17.5% of theory.

Analysis: C H N S 2 HCl; mol. wt. 346.32.Calculated: C, 52.02%; H 6.12%; N 12.11%. Found: C

EXAMPLE 26 Using a procedure analogous to that described in Example 4, 2-amino-6-(oz-phenethyl)-4,5,7,8-tetrahydro- 6H-thiazolo[5,4-d]azepine .dihydrochloride, m. p. 204C. (decomp.), was prepared from l-(aphenethyl)-hexahydro-4H-azepin-4-one (b. p. C. at 0.1 mm Hg). The yield was 32% of theory.

Analysis: C I-1 N S 2 HCl; mol. wt. 346.32.Calculated: C, 52.02%: H 6.12%; N 12.11%. Found: C

EXAMPLE 27 Using a procedure analogous to that described in Example 4, 2-amino-4,5,7,8-tetrahydro-6H-thiazolo[5,4- d]azepine dihydrochloride, m. p. 254C. (decomp.), of the formula was prepared from hexahydro-4H-azepin-4-one hydrochloride (m. p. 177 178C.). The yield was 18% of theory.

Analysis: C H N S 2 H01; mol. wt. 242.17.Calcu lated: C, 34.72%;-H 5.41%; N 17.35%. Found: C

EXAMPLE 28 Using a procedure analogous to that described in Example 1 2-amino-6-methyl-4,5 ,7 ,8-tetrahydro-6H- thiazolo [5,4-d]azepine dihydrochloride, m. p. 257C. (decomp.), of the formula was prepared from 1-methyl-5-bromo-hexahydro-4H- azepin-4-one hydrobromide (m. p. 110C.). The yield was 52% of theory.

Analysis: Cg H N 8 2 HCl; mol. wt. 256.20. Calculated: C, 37.50%; H 5.90%; N 16.40%. Found: C 37.45%; H 6.27%; N 16.35%.

EXAMPLE 29 Using a procedure analogous to that described in Examples 1 and 2, 2-amino-6-ethyl-4,5,7,8-tetrahydro- 6l-l-thiazolo[5,4-dlazepine dihydrochloride, m. p. 228C. (decomp.), was prepared from l-ethyl-S- bromo-hexahydro-4H-azepin-4-one hydrobromide (m. p. 138C.). The yield was 52% of theory.

Analysis: C H N S 2 HCl; mol. wt. 270.23. Calculated: C, 40.01%; H 6.34%; N 15.55%. Found: C 39.90%; H 6.28%; N 15.32%.

EXAMPLE 30 Using a procedure analogous to that described in Example 2-amino-6-n-propy1-4,5,7,8-tetrahydro-6H- thiazolo [5,4-d]azepine, m. p. 145C., was prepared from 1-n-propyl-5-bromo-hexahydro-4H-azepin-4-one hydrobromide (m. p. 126C). The yield was 56% of theory.

Analysis: C l-l N S; mol. wt. 21 1.32.Calculated:C, 56.27%; H 8.11%; N 19.88%. Found: C 56.65%; H 8.05%; N 19.75%.

EXAMPLE 31 Using a procedure analogous to that described in Examples 1 and 2, 2-amino-6-isopropyl-4,5,7,8- tetrahydro-6H-thiazolo[5,4-dlazepine dihydrochloride, m. p. 225C. (decomp.), was prepared from 1- isopropyl-S-bromo-hexahydro-4H-azepin-4-one hydrobromide (m. p. l 14C.). The yield was 35% of theory.

Analysis: C H N 8 2 HCl;mo1. wt. 284.25. Calculated: C, 42.25%; H 6.74% N 14.78%;. Found: C 41.90%; H 7.05%; N 14.40%.

EXAMPLE 32 Using a procedure analogous to that described in Examples l and 2, 2-amino-6-n-butyl-4,5,7,8-tetrahydro- 6H-thiazolo[5,4-d]azepine dihydrochloride, m. p. 254- 256C. (decomp.), was prepared from 1-n-butyl-5- bromo-hexahydro-4H-azepin-4-one hydrobromide (m. p. 144C.). The yield was 59% of theory.

Analysis: C H N S 2 HC1;mol. wt. 298.28. Calculated; (1,4429%; H 7.10%; N 14.08%. Found: C 44.20%; H 6.88%; N 13.86%.

EXAMPLE 33 Using a procedure analogous to that described in Example 1, 2-amino-6-isobutyl-4,5,7,8tetrahydro-6H- thiazolo [5,4-d]azepine dihydrochloride, m. p. 238C. (decomp.), was prepared from 1-isobutyl-5-brom0- hexahydro4H-azepin-4-one hydrobromide. The yield was 41% of theory.

Analysis: C l-l N 2 HCl; mol. wt. 298.28. Calculated: C, 44.29%; H 7.10%; N 14.08%. Found: C 44.50%; H 7.10%; N 13.96%.

EXAMPLE 34 Using a procedure analogous to that described in Example 4, DL-2-amino-6-(butyl-2')-4,5,7,8-tetrahydro- 6H-thiazo1o[5,4-d]azepine dihydrochloride, m. p.

236C. (decomp.), ws prepared from DL-1-(butyl-2)- hexahydro-4H-azepin-4-one (b. p. 58-60C. at 0.1 mm Hg). The yield was 17% of theory.

Analysis: C H N S 2 HC1;mo1. wt. 298.28.Ca1culated: C, 44.29%; H 7.10%; N 14.08%. Found: C 44.10%; H 7.20%; N 13.98%.

EXAMPLE 35 EXAMPLE 36 Using a procedure analogous to that described in Example 4, 2-amino-6-allyl-4,5,7,8-tetrahydro-6H- thiazolo [5,4d]azepine dihydrochloride, m. p. 245C. (decomp.), of the formula was prepared from 1-allyl-hexahydro-4H-azepin-4-one (b. p. 52 54C. at 0.2 mm Hg). The yield was 67% of theory.

Analysis: C H N S 2 HCl; mol. wt. 282.24. Calculated; C, 42.51%; H 6.07%; N 14.88%. Found: C 42.60%; H 6.03%; N 14.90%.

EXAMPLE 37 Using a procedure analogous to that described in Example 4, 2-amino-6-hexahydrobenzy1-4,5,7,8- tetrahydro-6H-thiazolo[ 5 ,4-d azepine dihydrochloride, m. p. 240C. (decomp.), of the formula was prepared from 1-hexahydrobenzyl-hexahydro-4H- azepin-4'one hydrochloride (m. p. 180C.). The yield was 40% of theory.

Analysis: C H N 5 2 HCl; mol. wt. 338.45. Calculated: C, 49.69%; H 7.45%; N 12.42%. Found: C 49.40%; H 7.36%; N 12.40%.

EXAMPLE 38 Using a procedure analogous to that described in Example 1, 2methylamino-6-ethyl-4,5,7,8-tetrahydro- 6l-l-thiazolo[5,4-d]azepine dihydrochloride, m. p. 206C. (decomp.), of the formula 1 I Analysis: C H N S; mol. wt. 237.35. Calculated: f I V C; 60.75%; H, 8.05 N, 17.73%. Found: C,60.50%;

' v H,8.16%;N, 17.60%.

EXAMPLE 43 Using aprocedu're analogous to that described in Example 4, 2-n-amylamino-6-allyl-4,5,7,8-tetrahydro-6H- E thiazo1o[5,4-d]azepine, m. p. 20C., was prepared was prepared from l ethyl-5-bromofhexahydro-4H- 'Q y y p fia'zepin-4-one hydrobromide (m. p. 138C.) and N- l0 m Hg) and y h -NH CH. 2 H'cr methyl-thiourea. The yield was 27% of theory. 'yield wa5 54% of theory;

Analysis; Cw H" 5 2 m 8 3 1 u Analysis: C H N3S; mol. wt. 279.43. Calculated: lated: c, 42.30%; H 6.75%; N 14.80%. Found: c C, H, 1504% d: 41.90%;11 7.05%; N 14.48%. H 991%; N

-' 5 EXAMPLE 3 l EXAMPLE 44 Using a procedure analogous to that described in Example 4, 2-allylamino-6-a11yl-4,5,7,8-tetrahydro-61-1- thiazolo[5,4-d]a zepine dihydrochloride, m. p. 20C.,

20 of the formula Using a procedure analogous to that described in Example 1, 2-ethylamino-6-ethyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine dihydrochloride, m. p. 231C. (decomp.), was prepared from l-ethyl-S-bromohexahydro-4H-azepin-4-one hydrobromide (m.- p. 138C.) and N-ethyl-thiourea. The yield was of theory.

Analysis: C H 'N S 2 HC1;mo1. wt. 298.34. Calculated: C, 44.30%; H ,'7.09%;'N 14.10%. Found: C 44.65%; H 6.97%: N, 13.93%.

EXAMPLE was prepared from l ally1-heXahydro-4H-azepin-4-one Using a procedure analogous to that described in Ex- 30 52 54C, at 0,2 mm Hg) and N-allyl-thiourea. ample 1, 2-n-propylamino-6-et'hyl-4,5,7,8-tetrahydro- Th i ld a 48% f the or l p dihydmchloride, P- Analysis: C1 H 9N S; mol. wt. 249.36. Calculated: 228C. (decomp), was prepared from l-ethyl-S- c 62 62%;l-I, 758%; N, 16,85% F und; C, 62.60%; brorno-hexahydro-4H-azepin-4-one hydrobromide-(m. H 7.64%;N 16.60%. p. 138C.)and N-n-propylthiourea. The'yield was 55% 5 EXAMPLE of theory. a 7

Analysis: C H N S 2 HCl; mol. wt. 312.36. Calcu- Using a procedure analogous to that described in Exlated: C, 46.20%; H 7.42%; N 13.45%. Found; C ample 4, 2-cyclohexylamino-6-allyl-4,5,7,8-tetrahydro- 46.40%; H 7.42%; N 13.68%. 6H-thiazolo[5,4-d]azepine, m. p. 20C., of the for- 40 mula EXAMPLE 41 Using a procedure analogous to that described in Example 1, 2-isopropylamino-6-ethyl-4,5,7,8-tetrahydro- N 6H-thiazo1o[5,4-d]azepine dihydrochloride, m. p. CH4?" CH N. NH

244C. (decomp), was prepared from l-ethyl-S- 45 bromo hexahydro-4H-azepin-4-one hydrobrpmide (m.

p. 138C.) and N-isopropyl-thiourea. The yield was of theory. I I

Analysis: C H N 5 2 HC1; mo1. wt. 312.36. Calcuo o 1ated;C, 46.20%; H 7.42%; N 13.45%. Found: c, 50 ig s' i? ga N 461576; H 141%; N Analysis: C 6H2 N S; mol. wt. 291.44. Calculated: M L 42 C,65.99%; H; 81 65%; N, 14.44%. Found: C, 66.20%;

was prepared from 1-a1lyl-hexahydro-4H-azepin-4-one Using a procedure analogous to .that described in Ex- 5 ample 4, 2-ethylamino-6-a1lyl-4,5,7,8-tetrahydro-6H- EXAMPLE 46 thiazo1o[5,4-d]azepine. m. p. C. 0f the formula Using a procedure analogous to that described in Example 4, 2-pher1ylamino-6-ally1-4,5,7,8-tetrahydro-6H thiazolo[5,4-d]azepine dihydrochloride, m. p. 195C., N 6 of the formula was prepared from :1 a1ly1 -he gahydrq-,4H azep1n-4-one -.P- 39.4! Q1 1 4516141 9 lfl- -thi u a- The yield was 26% of theory.

was prepared from l-allyl-hexahydro-4H-azepin-4-one (b. p. 52 54C. at 0.2 mm Hg) and N-phenylthiourea. The yield was 52% of theory. Analysis: C H N S'2 mOl. Calculated: C, 53.60%;-H, 5.91%; N, 11.73%. Found: C, 53.40%; H, 6.13%; N, 11.47%.

EXAMPLE 47 Using a procedure analogous to that described in Example 4, Z-methylamino-6-bcnzyl 4,5,7,8-tetrahydro- 6H-thiazolo[5,4-d]azepine, m. p. 117C., of the formula l -NH CH,

was prepared from l-benzyl-hexahydro-4H-azepin- 4-one (b. p. 98l00C. at 0.1 mm Hg) and N-methylthiourea. The yield was 22% of theory.

Analysis: CmHmNgS, mol. wt. 237.39. Calculated: C, 65.95%; H, 7.05%; N, 15.35%. Found: C, 65.70% H, 6.99%; N, 15.20%.

EXAMPLE 48 EXAMPLE 49 Using a procedure analogous to that described in Example 48, 2-n-propylamino-6-benzyl-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d1azepine, m. p. 80C., was prepared from 1-benzyl-hexahydro-4H-azepin- 4-one (b. p. 98l0OC. at 0.1 mm Hg) and N-n-propylthiourea. The yield was 50% of theory.

Analysis: C H N S;molwt.301.44. Calculated: C, 67.74%; H, 7.69%; N, 13.92%. Found: C, 67.90%; H, 7.67%; N, 13.90%.

EXAMPLE 50 Using a procedure analogous to that described in Example 48, 2-isopropylamino-6-benzyl-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]azepine, m. p. 96C., was prepared from l-benzyl-hexahydro-4H-azepin- 4-one (b. p. 98l00C. at 0.1 mm Hg) and N-isopropyl-thiourea. The yield was 60% of theory.

Analysis: C11H23N3S; mol. wt. 301.44. Calculated: C, 67.74%; H,7.69%; N, 13.92%. Found: C, 67.70%; H, 7.64%; N, 13.78%.

EXAMPLE 51 2-Amino-6-ethyl-4,5,7,8-tetrahydro-6H-oxazolo[5,4- d]azepine and its dihydrochloride by method A 17 gm (56.6 millimols) of l-ethyl-5-bromohexahydro-4H-azepin-4-one hydrobromide were intimately admixed with 10.5 gm (175 millimols) of urea, and 1 m1 of glacial acetic acid was added to the mixture. The resulting mixture was melted by heating to between and C and was held at that temperature for from 5 to 8 hours. Thereafter, the molten mass was allowed to cool, was then dissolved in water, and the aqueous solution was adjusted to pH 12 with sodium hydroxide and extracted with chloroform. The combined chloroform extracts were dried and evaporated, and the residue was recrystallized from ethyl acetate, yielding 4.2 gm (41% of theory) of the free base, m.p. l52153C, of the formula.

The free base was dissolved in ethanol, the resulting solution was acidified with isopropanolic hydrochloric acid, ether was added to the acidic solution, and the precipitate formed thereby was collected, yielding the dihydroehloride, m.p. 2l7-2l9C. (decomp.).

Analysis: C,,H, N O 2 HCl; mol. wt. 254.06. Calculated: C, 42.56%; H, 6.74%; N, 16.54%. Found: C,42.70%; H, 6.84%; N, 16.72%.

EXAMPLE 52 Using a procedure analogous to that described in Example 51, 2-amino-6-n-propyl-4,5,7,8-tetrahydro-6H- oxazoI'o[5,4-d]azepine, m.p. 122C (ether), and its dihydrochloride, m.p. 221C (decomp.). of the formula were prepared from 1-n-propyl-5-bromo-hexahydro- 4H-azepin4-one hydrobromide and urea. The yield was 42% of theory.

Analysis: C 0H11N O 2 HCl; mol. wt. 268.19. Calculated: C, 44.78%; H, 7.14%; N, 15.67%. Found: C, 44.90%; H, 7.26%; N, 15.62%.

EXAMPLE 53 Using a procedure analogous to that described in Exarnple 5 l 2-amino-6-isopropyl-4,5,7,8-tetrahydro-6H- oxazolo[5,4,-d]azepine, 'm.p. l 10C, was prepared from l-isopropyl-5-bromo-hexahydro-4H-azepin-4-one hydrobromide and urea. The yield was 38% of theory.

Analysis: C10H17N O; mol. wt. 195.25. Calculated: C, 61.55%; H, 8.77%; N, 21.55%. Found: C, 61.75%; H, 8.93%; N, 21.80%.

EXAMPLE 54 Using a procedure analogous to that described in Example 5 1, 2-amino-6-n-butyl-4,5,7,8-tetrahydro-6H- oxazolo[5,4-d]az'epine dihydrochloride, m.p. 210C ('decomps), was preparedfrom l-n-butyl-S-bromohexahydro-4H-azepin-4-one hydrobromide and urea. The yield was 41% of theory.

Analysis: C11H19N3O-2 HC1;mol. wt. 282.28. Calculated: C, 46.72%; H, 7.49%; N, 14.86%. Found: C, 46.75%; H, 7.53%; N, 14.87%.

EXAMPLE 55 Using a procedure analogous to that described in Example 51, 2-amino-6-isobutyl-4,5,7.8-tetrahydro-6H- oxazolo[5,4-d]azepine dihydrochloride, m.p. 210C (decomp.), was prepared from l-isobutyl-S-bromohexahydro-4H-azepin-4-one hydrobromide and urea. The Yield was 43% of theory.

Analysis: C11H19N30'2 mol. wt. Calculated: C, 46.72%; H, 7.49%; N, 14.86%. Found: C, 46.50%; H, 7.52%; N, 15.06%.

EXAMPLE 56 Using a procedure analogous to that described in Example 51, 2-amino-6-allyl-4,5,7,8-tetrahydro-6H- oxazolo [5,4-d1azepine dihydrochloride, m.p. 209C (decomp.), of the formula was prepared from 1-allyl-5-bromo-hexahydro-4H- azepin-4-one hydrobromide and urea. The yield was 12% of theory.

Analysis: C H N O-2 HCl; mol. wt. 266.24. Calculated: C, 45.10%; H, 6.43%; N, 15.80%. Found: C, 45.00%; H, 6.52%; N, 15.70%.

EXAMPLE 57 Using a procedure analogous to that described in Example 51, 2-amino-6-benzyl-4,5,7,8-tetrahydro-6H- oxazolo [5,4-d]azepine dihydrochloride, m.p. 209C (decomp.), of the formula was prepared from 1-benzyl-5-bromo-hexahydro-4H- azepin-4-one hydrobromide and urea. The yield was 48% of theory I Analysis: C H 1N O-2 l-lCl; mol. wt. 316.24. Calculated: C, 53.20%; H, 6.06%; N, 13.29%. Found: C, 53.25%; H, 6.25%; N, 13.15%.

EXAMPLE 58 Using a procedure analogous to that described in Example 5 1, 2-amino-6-hexahydrobenzy1-4,5 ,7,8-tetrahydro-6H-oxazolo[ 5,4-d]azepine dihydrochloride, m.p. 228229C (decomp.), of the formula was prepared from 1-hexahydrobenzyl-5-bromohexahydro-4H-azepin-4-one hydrobromide and urea. The yield was 18% of theory.

Analysis: C H N O 2 HCl; mol. wt. 322.27.Calculated: C, 52.18%; H, 7.85%; N, 13.04%. Found: C, 51.90%; H, 7.65%; N, 12.90%.

EXAMPLE 59 Using a procedure analogous to that described in Example 51, 2-amino-6-(p-methyl-benzyl )-4,5,7,8- tetrahydro-6H-oxazolo[ 5,4-d]azepine dihydrochloride, m.p. 204C (decomp.), of the formula o NH2'2HCl was prepared from l-(p-methyl-benzyl)-5-brom0- hexahydro-4l-l-azepin-4-one hydrobromide and urea. The yield was 23% of theory.

Analysis: C H N O'2 HCl; mol. wt. 330.24. Calculated: C, 54.56%; H, 6.41%; N, 12.72%. Found: C, 54.90%; H, 6.98%; N, 12.40%.

EXAMPLE 60 2-Amino-6-( ,B-hydroxy-ethyl )-4,5 ,7,8-tetrahydro-6H- thiazolo [5,4-d]azepine dihydrochloride by method B 20.5 gm (137 millimols) of hexahydro-4H-azepin- 4-one were dissolved in a mixture consisting of 180 ml of glacial acetic acid and 20 m1 of a 40% hydrogen bromide solution in glacial acetic acid, and brominated at room temperature with a solution of 22 gm of bromine in m1 of glacial acetic acid. Thereafter, the glacial acetic acid and the hydrogen bromide were distilled off, the residual raw 5bromo-hexahydro-4H-azepin- 4-one hydrobromide was dissolved in 250 ml of ethanol, 24.7 gm of N-benzoyl-thiourea were added, and the mixture was heated at its boiling point for 14 hours. During that time 31 gm (64% of theory) of 2- benzamido-4,5 ,7 ,8-tetrahydro-6l-l-thiazolo 5 ,4- dlazepine hydrobromide crystallized out, which were collected and converted into the free base with sodium hydroxide. The free base was dissolved in 200 ml of methanol, 6 gm of ethyleneoxide were added to the solution, and the mixture was stirred at room temperature. Thereafter, the methanol was evaporated, the residue 2-benzamido-6-(,B-hydroxy-ethyl)-4,5,7,8- tetrahydro6H-thiazolo[5,4-d]azepine was dissolved in ethanol, and the resulting solution was acidified with isopropanolic hydrochloric acid, yielding 42% of theory of 2-benzamido-6-( B-hydroxy-ethyl )-4,5 ,7 ,8- tetrahydro-6H-thiazolo[ 5 ,4-d] azepine-hydrochloride m.p. 146C. This compound was then hydrolized by boiling for 8 hours with aqueous 20% hydrochloric acid, the reaction solution was subsequently made alkaline with sodium hydroxide and then extracted with chloroform, the chloroform extracts were evaporated, the residue 2-amino-6-(,8-hydroxy-ethyl)-4,5,7,8- tetrahydro-6H-thiazolol5,4-dlazepine was dissolved in ethanol, the solution was acidified with isopropanolic hydrochloric acid, and acetone was added to the acidic solution to precipitate the reaction product. 55% of theory of the dihydrochloride, m. p. 192C (decomp.), of the formula 10 N HOCH -CH N NH 2 HCI S were obtained.

Analysis: C9H15N OS2 HCl; mol. wt. 286.22. Calculated: C, 37.81%; H, 5.99%; N, 14.68%. Found: C, 37.65%; H, 5.83%; N, 14.67%.

EXAMPLE 61 Using a procedure analogous to that described in Ex- 75 ample 60, 2-amino-6-(,B-hydroxy-propyl)-4,5,7,8- tetrahydro-6H-thiazolo[5,4-d]a2epine dihydrochloride, m.p. 221C (decomp.), of the formula was prepared from 2-benzamido-4,5,7,8-tetrahydro- 6H-thiazolo [5,4-d1azepine and propyleneoxide. The yield was 43% of theory.

Analysis: C H N OS-2 HCl; mol. wt. 300.25.

Calculated: C, 39.95%; H, 6.38%; N, 13.98%. Found: C,40.00%; H, 6.47%; N, 13.75%.

The compounds embraced by formulas 1 and la above and their non-toxic acid addition salts have useful pharmacodynamic properties. More particularly, the compounds exhibit hypotensive, sedative, antitussive and antiphlogistic activities, coupled with very low toxicity, in warm-blooded animals, such as cats, mice and rats. All of the compounds exhibit all of these pharmacological properties, although one of these activities may be more pronounced than the others, depending upon the particular R,- and R -substitution.

Thus, the hypotensive activity is particularly pronounced in those compounds of the formula 1 wherein R is alkyl, allyl or an unsubstituted or substituted ara1- kyl radical and R is hydrogen. Especially noteworthy is the fact that, among this sub-generic class of compounds, those wherein R is unsubstituted or substituted aralkyl produce no initial increase in the blood pressure and only minor sedative effects.

The effects upon the blood pressure were ascertained on cats under a-D-(+)-g1ucochloralose/urethane anesthesia. These tests showed that the hypotensive activity is especially pronounced in the following compounds:

2-Amino-6-benzyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine, 2-Amino-6-(p-chloro-benzyl)-4,5,7,8tetrahydro- 6Hthiazolo [SA-d]azepine,

2-Amino-6-(m-bromo-benzyl)-4,5,7,8-tetrahydro- 6H-thiazolo [5,4-d]a2epine, 2-Amino-6-(4'-methyl-benzyl)-4,5,7,8-tetrahydro- H-thiazolo [SA-d]azepine, 2-Amino6-(p-trifluoromethyl-benzyl)-4,5,7,8-

tetrahydro-6H-thiazolo[ 5 ,4-d azepine 2-Amino-6-(m-trifluoromethyl-benzyl)-4,5,7,8- tetrahydro-6H-thiazolo[5 ,4-d azepine, and 2-Amino-6-(p-fluoro-benzyl)-4,5,7,8-tetrahydro-6H- thiazolo [SA-d]azepine.

The compounds of the formulas 1 and 1a wherein R is alkyl or allyl and R is hydrogen exhibit also very effective antiphlogistic, sedative and antitussive activities.

In compounds of the formula I wherein R and R are both alkyl the sedative activity is especially pronounced.

The antitussive activity was ascertained in rats by the standard test method of Engelhorn and Puschmann, Arzneimittelforschung 13, 474 1963 and this activity was found to be particularly pronounced in the following compounds:

2-Amino-6-butyl-4,5,7,8-tetrahydro-6l-1- thiazolo[5,4-d1azepine, 2-Amino-6-allyl-4,5,7,8-tetrahydro-6H-thiazolo[5,4-

d]azepine, 2-Amino-6-ethyl-4,5,7,8-tetrahydro-61-1- oxazolo[5,4-d]azepine, and 2-Amino-6-allyl-4,5,7,8-tetrahydro-6H-oxazolo[5,4-

d]azepine.

The sedative activity was ascertained in mice by the standard test method of Friebel et a1., Arzneimittelforschung 9, 126 (1959), and this activity was found to be particularly pronounced in the following compounds:

2-Amino-6-allyl-4,5,7,8-tetrahydro-61-l-oxazolo[5,4-

d]azepine, 2-Amino-6-ethyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine,

2-Amino-6-isopropyl-4,5 ,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine, 2-Ethylamino-6-ethyl-4,5,7,8-tetrahydro'6H- thiazolo[5,4-d]azepine, and 2-Ethylamino-6-propyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d]azepine.

The antiphlogistic activity was ascertained, in terms of the anti-exudative effect against the carrageeninedema in the hind paw of the rat, by the standard test method of Winter et al., Proc. Soc. exper. Biol. Med. 1 1 1, 544-547 1962), and against the kaolin-edema in the hind paw of the rat by the method of Hillebrecht, Arzneimittelforschung 4, 607-614 (1954). These tests showed that the antiphlogistic activity is particularly pronounced in the following compounds:

2-Amino-6-a1lyl-4,5 ,7 ,8-tetrahydro-6H-thiazolo 5 ,4-

d]azepine, 2-Amylamino-6-allyl-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d1azepine, and 2-Allylamino-6-al1yl-4,5,7,8-tetrahydro-6H thiazolo[5,4-dlazepine.

For pharmaceutical purposes the compounds are administered to warm-blooded animals perorally or parenterally as active ingredients in customary dosage unit compositions, that is, compositions in dosage unit form consisting essentially of an inert pharmaceutical carrier and one effective dosage unit of the active ingredient, such as tablets, coated pills, capsules, wafers, powders, solutions, suspensions, emulsions, syrups, suppositories ,2 1 and the like. One effective dosage unit of the compounds is from 0.0033 to 0.167 mgm/kg body weight, preferably l0033to 0.084 mgm/kg body weight. The average daily dose is from 0.003 3' to=0.34 mgm/kg body weight, preferably from 0.0033 to 0.167 mgm/kg body weight.

The following examples illustrate a. few dosage unit compositions comprising a compound of the formula I or la or a non-toxic acid addition salt thereof as an active ingredient and represent the best modes contemplated of putting the invention into practical use. The parts are parts by weight unless otherwise specified.

EXAMPLE 62 Coated Pills The pill core composition is compounded from the following ingredients:

azepine ZHCl 5.0 parts Lactose 33.5 Corn starch 10.0 Gelatin 1.0 Magnesium stearate 0.5

Total 50.0 parts Preparation:

The thiazoloazepine compound is intimately admixed with the lactose and the corn starch,'the mixture is moistened with an aqueous solution of the gelatin, the moist mass is granulated by forcing it through a 1 mm-mesh screen, the granulate is dried at 40C and again passed through the screen, admixed with the magnesium stearate, and the composition is com-,

pressed into 50 mgm-pill cores. The entire procedure must be carried out in a darkened room. The pill cores are then coated with a thin shell consisting essentially of a mixture of sugar and talcum, and the coated pills are polished with beeswax. Each pill contains 5.0 mgm of the thiazoloazepine compound and is an oral doage unit composition with effective hypotensive action.

EXAMPLE 63 Drop solution The solution is compounded from the following ingredients:

Preparation: I

The p-hydroxy-benzoic acid alkyl esters, the oil of anise and the methol are dissolved in the ethanol (solution A). v v i The buffers, the thiazoloazepine compound and the sodium cyclamate are dissolved in distilled water, and the glycerin is added thereto (solution B)..-: 7

Solution A is stirred into solution B, .rnixtureis diluted with distilled water to the indicated volume, the

finished solution is filtered, and the filtrate is filled into brown ml-bottles. I

All of the above operations must be carried out under exclusion of light and in an inert gas atmosphere.

1 ml (about 20 drops) of the solution contains 5 mgm of the thiazoloazepine compound and is an oral dosage unit composition with effective hypotensive action.

EXAMPLE 64 Suppositories The suppository composition is compounded from the following ingredients:

azepine 2 HCl I 10.0 parts Suppository base (e.g. Cocoa butter) 1690.0

Total 1 700.0 parts Preparation:

The finely powdered thiazoloazepine compound is blended with the aid of an immersion homogenizer into the suppository base which had previously been melted and cooled to 40C. 1700 mgm-portions of the composition are poured at 35C into cooled suppository molds. Each suppository contains 10 mgm of the thiazoloazepine compound and is a rectal dosage unit composition with effective hypotensive action.

EXAMPLE 65 l-lypodermic Solution The solution is compounded from the following ingredients:

2-Amino-6-( p-chloro-benz yl )-4,5.7.8-

tetrahydro-ol-l-thiazolol 5 Ad] Preparation:

The buffers, the thiazoloazepine compound and the sodium pyrosulfiteare successively dissolved in a sufficient amount of distilled water which had previously been boiled and allowed to cool in an atmosphere of carbon dioxide. The solution is diluted to the indicated volume with additional boiled distilled water, filtered until free from suspended matter, and the filtrate is filled into brown 1 cc-ampules in an inert gas atmosphere, which aresealed and sterilized for 20 minutes at C. The preparation of the solution and the filling procedure must be carried out in a darkened room. Each ampule contains 5 mgm of the thiazoloazepine compound and the contents thereof are a parenterally injectable dosage unit composition with effective hypotensive action.

A dosage unit composition of the instant invention may also contain one or more other active ingredients having the same or different pharmacological properties, as illustrated by the following examples.

EXAMPLE 66 Coated pills The pill core composition is compounded from the following ingredients:

2-Amino-6-( p-chloro-benzyl )-4,5 ,7,8-

tetrahydro-(sH-thiazolol 5,4-d 1 azepine 2 HCl 0.2 parts 2,6-Bis-(diethanol-amino)-4,8-dipiperidino-pyrimidol 5,4-d lpyrimidine 25.0 Digoxin 0.25 Lactose 66.55 Potato starch 25.0 Polyvinylpyrrolidone 2.0 Magnesium stearate 1.0

Total 120.0 parts Preparation:

The thiazoloazepine compound, the pyrimidopyrimidine compound, the digoxin, the potato starch and the lactose are intimately admixed with each other, the mixture is moistened with an ethanolic 10% solution of the polyvinylpyrrolidone, the moist mass is granulated by forcing it through a 1.5 mm-mesh screen. the granulate is dried at 40C and again passed through a 1 mmmesh screen, the dry granulate is admixed with the magnesium stearate, and the finished composition is compressed into 120 mgm-pill cores, which are coated with a thin shell consisting essentially of a mixture of sugar and talcum, and polished with beeswax. Each pill contains 0.2 mgm of the thiazoloazepine compound, 25 mgm of the pyrimidopyrimidine compound and 0.25 mgm of digoxin, and is an oral dosage unit composition with effective hypotensive, coronary vasodilating and cardiotonic actions.

EXAMPLE 67 Gelatin capsules The capsule filler composition is compounded from the following ingredients:

2-Amino-6-( p-chloro-benzyl )-4,5.7.8-

tetrahydro-oH-thiazolol 5,4-d]

azepine 2 HCl 5.0 parts Codeine phosphate 10.0 Tartaric acid 1.0 Corn starch 84.0

Total lOU.0 parts Preparation:

The ingredients are intimately and homogeneously admixed with each other, and 100 mgm-portions of the mixture are filled into opaque gelatin capsules of suit able size. Each capsule contains 5 mgm of the thiazoloazepine compound and mgm of codeine phosphate, and its contents are an oral dosage unit composition with effective hypotensive and antitussive actions.

Analogously any one of the other compounds embraced by formulas l and la, or a nontoxic acid addition salt thereof, may be substituted for the particular thiazoloazepine salt in Examples 62 through 67. Likewise, the amount of active ingredient in these illustrative examples may be varied to achieve the dosage unit range set forth above, and the amounts and nature of the inert pharmaceutical carrier ingredients may be varied to meet particular requirements.

While the present invention has been illustrated with the aid of certain specific embodiments thereof, it will be readily apparent to others skilled in the art that the invention is not limited to these particular embodiments, and that various changes and modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

We claim:

1. A pharmaceutical dosage unit composition consisting essentially of an inert pharmaceutical carrier and an effective hypotensive, sedative, antitussive or antiphlogistic amount of a compound of the formula clohexyl, phenyl, benzyl or phenethyl, or a non-toxic, pharmacologically acceptable acid addition salt thereof.

2. A composition of claim 1, wherein said compound is one of the formula R, N X C NH.

wherein X is oxygen or sulfur, and R is allyl, alkyl of l to 3 carbon atoms, benzyl, halobenzyl, trifluoromethyl-benzyl or methylbenzyl, or a non-toxic, pharmacologically acceptable acid addition salt thereof.

3. A composition of claim 2, wherein said compound is 2-amino-6-benzyl-4,5,7,8-tetrahydro-6l-lthiazole[5,4-d]azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

4. A composition according to claim 2, which is 2- amino-6-(p-chloro-benzyl)-4,5,7,8-tetrahydro-6H- thiazolo [5,4-d1azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

5. A composition according to claim 2, which is 2- amino-6-(p-methyl-benzyl)-4,5,7,8-tetrahydro-6H- thiazolo [5,4-d]azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

6. A composition to claim 2, which is 2-amino-6-(ptrifluoromethyl-benzyl)-4,5,7,8-tetrahydro-6H- thiazolo[5,4-d1azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

7. A composition to claim 2, which is 2-amino-6-(mtrifluoromethyl-benzyl )-4,5 ,7 ,8-tetrahydro-6H- thiazolo[5,4-d1azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

8. A composition according to claim 2, which is 2- amino-6-allyl-4,5,7,8}tetrahydro-6H-thiazolo[5,4- d]azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.

wherein R is hydrogen, alkyl of l to 4 carbon atoms, hydroxy-alkyl of l to 4 carbon atoms, allyl, cyclohexyl, hexahydrobenzyl, phenyl, phenethyl, benzyl, monoor di-halobenzyl, mono-, dior trimethoxybenzyl, trifluoromethyl-benzyl or (alkyl of l to 3 carbon atoms)-benzyl, and

R is hydrogen, alkyl of l to 5 carbon atoms, allyl, cy-

clohexyl, phenyl, benzyl or phenethyl,

or a non-toxic, pharmacologically acceptable acid addition salt thereof.

12. The method of claim 1 1, wherein said compound is one of the formula wherein X is oxygen or sulfur, and R, is allyl, alkyl of l to 3 carbon atoms, benzyl, halobenzyl, trifluoromethyl-benzyl or methylbenzyl, or a non-toxic, pharmacologically acceptable acid addition salt thereof.

mg I UNITED STATES PATENT OFFICE CERTIFICATE OF CGRRECTION Patent No. 3,9 73% Dated Sentember 3, 97"

.Inventol-(s) GRISS, HAITI-TED KL EI'ZAII, E'JOLFGANG GRELL and LLLLuUl ZALLELAUSE It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

I i v IE1 Col; Line Title Page "SA-D" should read --[5," -d]-- l U, "SA-D" should read ---[5, !-d]-- m "M-H-" should read --:-H--

5 65 "HQ-3931" should read HE-09$}- 6 26 i sert -inafter spectrurn" 8 5'? -"239C." should read -'---238".---

1 13 "N, l50%$" should rear -N,l5.0

Engned and Scaled thls sixth D y of January 1976 [SEAL] Attest:

RUTH c. MASON c. MARSHALL DANN Arresting Officer (mmnissionvr oj'Parenrs and Trademarks 

1. A PHARMACEUTICAL DOSAGE UNIT COMPOSITION CONSISTING ESSENTIALLY OF AN INERT PHARMACEUTICAL CARRIER AND AN EFFECTIVE HYPOTENSIVE SEDATIVE ANTITUSSIVE OR ANTIPHLOGISTIC AMOUNT OF A COMPOUND OF THE FORMULA
 2. A composition of claim 1, wherein said compound is one of the formula
 3. A composition of claim 2, wherein said compound is 2-amino-6-benzyl-4,5,7,8-tetrahydro-6H-thiazole(5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 4. A composition according to claim 2, which is 2-amino-6-(p-chloro-benzyl)-4,5,7,8-tetrahydro-6H-thiazolo (5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 5. A composition according to claim 2, which is 2-amino-6-(p-methyl-benzyl)-4,5,7,8-tetrahydro-6H-thiazolo (5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 6. A composition to claim 2, which is 2-amino-6-(p-trifluoromethyl-benzyl)-4,5,7,8-tetrahydro-6H-thiazolo(5,4 -d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 7. A composition to claim 2, which is 2-amino-6-(m-trifluoromethyl-benzyl)-4,5,7,8-tetrahydro-6H-thiazolo(5,4 -d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 8. A composition according to claim 2, which is 2-amino-6-allyl-4,5,7,8-tetrahydro-6H-thiazolo(5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 9. A composition according to claim 2, which is 2-amino-6-ethyl-4,5,7,8-tetrahydro-6H-oxazolo(5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 10. A composition according to claim 2, which is 2-amino-6-allyl-4,5,7,8-tetrahydro-6H-oxazolo(5,4-d)azepine or a non-toxic, pharmacologically acceptable acid addition salt thereof.
 11. The method of lowering the blood pressure, inducing sedation, suppressing the cough reflex or counteracting inflammation in a warm-blooded animal in need of such treatment, which comprises administering to said animal an effective hypotensive, sedative, antitussive or antiphlogistic amount of a compound of the formula
 12. The method of claim 11, wherein said compound is one of the formula 